package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.common.ErrorCode;
import com.yupi.yupicturebackend.constant.UserConstant;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.manager.auth.StpKit;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import com.yupi.yupicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author Zing
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-04-03 11:30:21
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
        implements UserService {

    /**
     * 用户注册
     *
     * @param userAccount   用户账户
     * @param userPassword  用户密码
     * @param checkPassword 检验密码
     * @return
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1. 校验参数
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次密码不一致");
        }
        // 2. 检验用户是否已存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        Long count = this.baseMapper.selectCount(queryWrapper);
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复");
        }
        // 3. 加密密码
        String encryptPassword = getEncryptPassword(userPassword);
        // 4. 插入用户数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveResult = this.save(user);
        if (!saveResult) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败，数据库错误");
        }
        return user.getId();
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1. 校验
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        // 2. 加密用户输入的密码
        String encryptPassword = getEncryptPassword(userPassword);
        // 3. 查询数据库 用户是否存在
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("userAccount", userAccount);
        queryWrapper.eq("userPassword", encryptPassword);
        User user = this.baseMapper.selectOne(queryWrapper);
        // 数据库中没有本条数据：用户不存在/密码错误
        if (user == null) {
            log.info("user login failed, userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或者密码错误");
        }
        // 4. 保存用户的登录态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);
        // 记录用户登录态到 Sa-token，便于空间鉴权使用，注意保证该用户信息于 SpringSession 中的信息过期时间一致
        StpKit.SPACE.login(user.getId());
        StpKit.SPACE.getSession().set(UserConstant.USER_LOGIN_STATE, user);
        return this.getLoginUserVO(user);
    }

    /**
     * 获取加密后的密码
     *
     * @param userPassword
     * @return 加密后的密码
     */
    @Override
    public String getEncryptPassword(String userPassword) {
        // 加一个固定盐
        final String SALT = "Zing";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    /**
     * 系统内部使用（不用脱敏
     * 返回登录用户的信息
     *
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 判断用户是否登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObj;
        // 未登陆
        if (currentUser == null || currentUser.getId() == null) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 用户可能修改了自己的数据 建议重新查询数据库
        Long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (currentUser == null) {
            // 用户可能被删除（干了不好的事被管理员干了）
            // 但是不让用户知道自己被删了 哈哈哈
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        return currentUser;
    }

    /**
     * 返回脱敏类的用户信息
     *
     * @param user
     * @return 脱敏的用户信息
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user, loginUserVO);
        return loginUserVO;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    /**
     * 获取脱敏后的用户列表
     *
     * @param userList
     * @return
     */
    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (userList.isEmpty()) {
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVO)
                .collect(Collectors.toList());
     /*return userList.stream()
             .map(user -> getUserVO(user))
             .collect(Collectors.toList());*/
    }

    @Override
    public boolean userLogout(HttpServletRequest request) {
        // 判断用户是否登录
        Object userObj = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        // 未登陆
        if (userObj == null) {
            throw new BusinessException(ErrorCode.OPERATION_ERROR, "未登录");
        }
        // 移除登录态
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    /**
     * 获取查询条件
     *
     * @param userQueryRequest
     * @return
     */
    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userName = userQueryRequest.getUserName();
        String userAccount = userQueryRequest.getUserAccount();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();

        QueryWrapper<User> queryWrapper = new QueryWrapper<>();

        queryWrapper.eq(ObjUtil.isNotEmpty(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);

        return null;
    }

    /**
     * 判断用户是否是 admin
     */
    @Override
    public boolean isAdmin(User user) {
        return user != null && user.getUserRole().equals(UserRoleEnum.ADMIN.getValue());
    }
}




